Now the favorable evidence in your hand is IOUs and various remittance documents. Through these, if one day the public security organ files a case or you know his whereabouts and file a civil lawsuit, it can be supported. QQ records and SMS records are difficult to be used as evidence, because they are relatively easy to forge, and the evidence has low effectiveness, and there is a risk of not being recognized.
I suggest that you report the case immediately, and at the same time start to collect some other favorable evidence, such as the witness testimony of the clothing factory owner you mentioned, or you can contact him to see if you can get your telephone recording and so on, so that he can admit his deception. Such a recording studio can be used as evidence. Only by asking the public security organs to file a case can we better safeguard our legitimate rights and interests. Otherwise, it will be difficult for you to make up for your loss.
In addition, I suggest that you can contact those who have been cheated by him and report the case hand in hand, so that the public security organs will be more attentive and can file a case smoothly. Your friend has constituted a crime of fraud, which is a criminal case. If you can file a case and take measures against him, if he has money, your loss can be made up.
I hope my answer can help you!